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Message-Id: <F12B47AA-DED2-4BD9-B144-2463A2AE6094@goldelico.com>
Date: Sat, 7 Sep 2019 09:37:35 +0200
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Benoît Cousson <bcousson@...libre.com>,
Tony Lindgren <tony@...mide.com>,
Rob Herring <robh+dt@...nel.org>,
Adam Ford <aford173@...il.com>,
André Roth <neolynx@...il.com>,
Mark Rutland <mark.rutland@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
Enric Balletbo i Serra <eballetbo@...il.com>,
Javier Martinez Canillas <javier@...hile0.org>,
Roger Quadros <rogerq@...com>,
Teresa Remmet <t.remmet@...tec.de>,
Nikolaus Schaller <hns@...delico.com>
Cc: Linux-OMAP <linux-omap@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-pm@...r.kernel.org,
Discussions about the Letux Kernel
<letux-kernel@...nphoenux.org>, kernel@...a-handheld.com,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] cpufreq: ti-cpufreq: add support for omap34xx and omap36xx
> Am 07.09.2019 um 08:56 schrieb H. Nikolaus Schaller <hns@...delico.com>:
>
> This adds code and tables to read the silicon revision and
> eFuse (speed binned / 720 MHz grade) bits for selecting
> opp-v2 table entries.
>
> Since these bits are not always part of the syscon register
> range (like for am33xx, am43, dra7), we add code to directly
> read the register values using ioremap() if syscon access fails.
>
> The format of the opp-supported-hw entries is that it has
> two 32 bit bitfields. E.g.:
>
> opp-supported-hw = <0xffffffff 3>
>
> The first value is matched against the bit position of the
> silicon revision which is (see TRM)
>
> omap34xx:
> BIT(0) ES1.0
> BIT(1) ES2.0
> BIT(2) ES2.1
> BIT(3) ES3.0
> BIT(4) ES3.1
> BIT(7) ES3.1.2
>
> omap36xx:
> BIT(0) ES1.0
> BIT(1) ES1.1
> BIT(2) ES1.2
>
> The second value is matched against the speed grade eFuse:
>
> BIT(0) no high speed OPP
> BIT(1) high speed OPP
>
> This means for the example above that it is always enabled
> while e.g.
>
> opp-supported-hw = <0x1 2>
>
> enables the OPP only for ES1.0 BIT(0) and if the high speed
> eFuse is set BIT(1).
>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
> drivers/cpufreq/ti-cpufreq.c | 91 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 89 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
> index 2ad1ae17932d..f2f58d689320 100644
> --- a/drivers/cpufreq/ti-cpufreq.c
> +++ b/drivers/cpufreq/ti-cpufreq.c
> @@ -31,6 +31,11 @@
> #define DRA7_EFUSE_OD_MPU_OPP BIT(1)
> #define DRA7_EFUSE_HIGH_MPU_OPP BIT(2)
>
> +#define OMAP3_CONTROL_DEVICE_STATUS 0x4800244C
> +#define OMAP3_CONTROL_IDCODE 0x4830A204
> +#define OMAP34xx_ProdID_SKUID 0x4830A20C
> +#define OMAP3_SYSCON_BASE (0x48000000 + 0x2000 + 0x270)
> +
> #define VERSION_COUNT 2
>
> struct ti_cpufreq_data;
> @@ -84,6 +89,13 @@ static unsigned long dra7_efuse_xlate(struct ti_cpufreq_data *opp_data,
> return calculated_efuse;
> }
>
> +static unsigned long omap3_efuse_xlate(struct ti_cpufreq_data *opp_data,
> + unsigned long efuse)
> +{
> + /* OPP enable bit ("Speed Binned") */
> + return BIT(efuse);
> +}
> +
> static struct ti_cpufreq_soc_data am3x_soc_data = {
> .efuse_xlate = amx3_efuse_xlate,
> .efuse_fallback = AM33XX_800M_ARM_MPU_MAX_FREQ,
> @@ -111,6 +123,56 @@ static struct ti_cpufreq_soc_data dra7_soc_data = {
> .multi_regulator = true,
> };
>
> +/*
> + * OMAP35x TRM (SPRUF98K):
> + * CONTROL_IDCODE (0x4830 A204) describes Silicon revisions.
> + * Control OMAP Status Register 15:0 (Address 0x4800 244C)
> + * to separate between omap3503, omap3515, omap3525, omap3530
> + * and feature presence.
> + * There are encodings for versions limited to 400/266MHz
> + * but we ignore.
> + * Not clear if this also holds for omap34xx.
> + * some eFuse values e.g. CONTROL_FUSE_OPP1_VDD1
> + * are stored in the SYSCON register range
> + * Register 0x4830A20C [ProdID.SKUID] [0:3]
> + * 0x0 for normal 600/430MHz device.
> + * 0x8 for 720/520MHz device.
> + * Not clear what omap34xx value is.
> + */
> +
> +static struct ti_cpufreq_soc_data omap34xx_soc_data = {
> + .efuse_xlate = omap3_efuse_xlate,
> + .efuse_offset = OMAP34xx_ProdID_SKUID - OMAP3_SYSCON_BASE,
> + .efuse_shift = 3,
> + .efuse_mask = BIT(3),
> + .rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
> + .multi_regulator = false,
> +};
> +
> +/*
> + * AM/DM37x TRM (SPRUGN4M)
> + * CONTROL_IDCODE (0x4830 A204) describes Silicon revisions.
> + * Control Device Status Register 15:0 (Address 0x4800 244C)
> + * to separate between am3703, am3715, dm3725, dm3730
> + * and feature presence.
> + * Speed Binned = Bit 9
> + * 0 800/600 MHz
> + * 1 1000/800 MHz
> + * some eFuse values e.g. CONTROL_FUSE_OPP 1G_VDD1
> + * are stored in the SYSCON register range.
> + * There is no 0x4830A20C [ProdID.SKUID] register (exists but
> + * seems to always read as 0).
> + */
> +
> +static struct ti_cpufreq_soc_data omap36xx_soc_data = {
> + .efuse_xlate = omap3_efuse_xlate,
> + .efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
> + .efuse_shift = 9,
> + .efuse_mask = BIT(9),
> + .rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
> + .multi_regulator = false,
> +};
> +
> /**
> * ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
> * @opp_data: pointer to ti_cpufreq_data context
> @@ -127,7 +189,17 @@ static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data,
>
> ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,
> &efuse);
> - if (ret) {
> + if (ret == -EIO) {
> + /* not a syscon register! */
> + void __iomem *regs = ioremap(OMAP3_SYSCON_BASE +
> + opp_data->soc_data->efuse_offset, 4);
> +
> + if (!regs)
> + return -ENOMEM;
> + efuse = readl(regs);
> + iounmap(regs);
> + }
> + else if (ret) {
> dev_err(dev,
> "Failed to read the efuse value from syscon: %d\n",
> ret);
> @@ -158,7 +230,17 @@ static int ti_cpufreq_get_rev(struct ti_cpufreq_data *opp_data,
>
> ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,
> &revision);
> - if (ret) {
> + if (ret == -EIO) {
> + /* not a syscon register! */
> + void __iomem *regs = ioremap(OMAP3_SYSCON_BASE +
> + opp_data->soc_data->rev_offset, 4);
> +
> + if (!regs)
> + return -ENOMEM;
> + revision = readl(regs);
> + iounmap(regs);
> + }
> + else if (ret) {
> dev_err(dev,
> "Failed to read the revision number from syscon: %d\n",
> ret);
> @@ -190,6 +272,11 @@ static const struct of_device_id ti_cpufreq_of_match[] = {
> { .compatible = "ti,am33xx", .data = &am3x_soc_data, },
> { .compatible = "ti,am43", .data = &am4x_soc_data, },
> { .compatible = "ti,dra7", .data = &dra7_soc_data },
> + { .compatible = "ti,omap34xx", .data = &omap34xx_soc_data, },
> + { .compatible = "ti,omap36xx", .data = &omap36xx_soc_data, },
> + /* legacy */
> + { .compatible = "ti,omap3430", .data = &omap34xx_soc_data, },
> + { .compatible = "ti,omap3630", .data = &omap36xx_soc_data, },
Well, I just realized that with the latest DTS changes,
ti,omap34xx and ti,omap36xx are legacy and
ti,omap3430 and ti,omap3630 are now official.
> {},
> };
>
> --
> 2.19.1
>
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